Another reason to buy the M1 0w40 for $25 per 5.1 quarts and stretch it out to 7,500 miles so your not wasting money. You will pay at least $7 per quart for the BMW dealer synthetic oil when the M1 is less than $5. Heck they used to have this stuff on rollback IIRC it was like $22.47 around these parts, a heck of a deal.